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No exploitation reported

CVE-2026-126305

EspoCRM before 10.0.9 Stored XSS via Knowledge Base Article Attachments

No exploitation reported by the sources we read.

  • Published2026-11-13
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

EspoCRM before 9.3.11 and 10.x before 10.0.9 contains a stored cross-site scripting vulnerability in Knowledge Base articles that lets users with Knowledge Base create or edit access attach a JavaScript file and add a crafted link to the article body. When an administrator clicks the link, the script runs in their session and can create an administrator account with attacker-chosen credentials.

Timeline

dates in UTC
  1. 2026-11-1309:36CVE publishedCNA

Versions per branch

Products declared by the CNA

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • espocrmother versions: not affected
    Affected
    • ≥ 10.0.0, < 10.0.9fixed in 10.0.9semver

    Not affected = 10.0.9

  • espocrmother versions: not affected
    Affected
    • < 9.3.11fixed in 9.3.11semver

    Not affected = 9.3.11

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-13

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-126305 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 4.08.52026-11-13
  • CNACVSS 3.17.32026-11-13
  • NVDCVSS 3.17.3read 2026-11-13
  • CNAweakness (CWE)CWE-792026-11-13
  • NVDweakness (CWE)CWE-79read 2026-11-13
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-11-13
Last Modified
2026-11-13
NVD status
Deferred
GitHub Advisory
GHSA-xx3w-rhgf-w529

Frequently asked questions

What is CVE-2026-126305?

EspoCRM before 9.3.11 and 10.x before 10.0.9 contains a stored cross-site scripting vulnerability in Knowledge Base articles that lets users with Knowledge Base create or edit access attach a JavaScript file and add a crafted link to the article body. When an administrator clicks the link, the script runs in their session and can create an administrator account with attacker-chosen credentials.

Is CVE-2026-126305 actively exploited?

Active exploitation of CVE-2026-126305 has not been confirmed.

What is the CVSS score for CVE-2026-126305?

CVE-2026-126305 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

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